The Connection general-header field allows the sender to specify options that are desired for that particular connection and MUST NOT be communicated by proxies over further connections.
The Connection header has the following grammar:
Connection-header = "Connection" ":" 1#(connection-token) connection-token = token
HTTP/1.1 proxies MUST parse the Connection header field before a message is forwarded and, for each connection-token in this field, remove any header field(s) from the message with the same name as the connection-token. Connection options are signaled by the presence of a connection-token in the Connection header field, not by any corresponding additional header field(s), since the additional header field may not be sent if there are no parameters associated with that connection option. HTTP/1.1 defines the "close" connection option for the sender to signal that the connection will be closed after completion of the response. For example,
in either the request or the response header fields indicates that the connection should not be considered `persistent' (section 8.1) after the current request/response is complete.
HTTP/1.1 applications that do not support persistent connections MUST include the "close" connection option in every message.